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Info about Data Loggers, introduction, Data Logger Types, portable data loggers, Data Logger FAQ, Data Logger Range, DL2e Data Logger

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Thermocouple Data Logger

Data Logger Range

Along with voltage input data loggers the Pico data acquisition range also includes loggers designed for specific applications:

The low-cost, educational DrDAQ data logger is used throughout the world by both educational institutions and individuals alike.

For measuring temperature and humidity data loggers such as the TC-08 thermocouple data logger and RH-02 temperature and humidity data logger offer an accurate solution to your measurement needs.

The pH Measuring Kit features Automatic Temperature Compensation, and allows you to accurate measure and record the acidity or alkalinity of a solution.

DL2e Data Logger

Battery powered, waterproof, rugged and portable
Expandable by the user to meet changing needs
Easy programming with Ls2Win Software
Impressive performance at low cost
The DL2e logger is an easy to use field data logger, well suited to remote site and laboratory applications. The DL2e system offers a wide choice of sensors, logging intervals, data collection and analysis facilities.

With the recent addition of Ls2Win PC Software, these features have been extended, and made even easier to access.

The applications for this logger are endless and thousands of DL2e Loggers are already installed.

Software

The DL2e Logger comes complete with the new Ls2Win PC software package. This sets up and controls the logger and also collects the stored data. Ls2Win is quick and easy to use and includes a time-saving library of sensor conversions.

Ls2Win greatly enhances the power of the logger, helping the user to organise modem communications, automatic data collection , data graphing (with Excel) etc. To find out more about Ls2Win, click here.

Users of earlier DL2 and DL2e Loggers can quickly UPGRADE to Ls2Win: click here for details.

Attach software (optional) allows a Psion Workabout (robust, handheld terminal) to be used to collect data and load new configurations into the logger. To download this software free of charge, please click here.

Inputs

The DL2e is compatible with almost every type of sensor that gives an output in terms of DC or AC voltage, resistance, count, frequency or status.

15 - 60 analogue or counter inputs.
6 - 24 channels for PRT and 4-wire sensors
2 resident digital inputs and 2 output relays as standard
During programming, each channel can be set up for sensor type and range, conversion factor, logging frequency (1 second to 24 hours) and valid reading range. Logged data is stored in battery-backed RAM, with capacity for 64k readings, expandable to 128k.

Dipper-log Data logger

dipper-log is a low cost single-channel data logger for continuously monitoring water levels in wells, boreholes and open bodies of water. Its small size allows the dipper-log to be used in well diameters as small as 3/4 of an inch (20mm).The dipper-log is a durable & reliable ground water data logger. It is very easy to launch and even easier to download when used in conjunction with a bar-log barometric logger. No need to open separate files, the Heron designed software does it all for you. Because of the unique “grab” of the barometric pressure during set up of the dipper-log there is no requirement for elevation correction. Down in the valley or on top of a mountain it is spot on every time.

feature

Small size allows dipper-log to be used in well diameters down to 3/4 inch (20mm). Passes through 1/2 inch NPT port.
Easy change battery (EL124 or equvilant) located in well head unit.
Stores up to 16000 readings.
Measures in both feet and meters.
Upload onto PC using Windows based software.
Programmable time, interval and prestart date.
Accurate to 0.1% full scale.
0.72 inch (18.5 mm) diameter by 6 inch (155 mm) long
Various head of water ranges.
Unvented, slim cable.
Direct read from top of well.
Includes 50 feet of cable, wellhead readout unit, software and universal mounting kit.
3 year limited warranty

Info from heroninstruments.com

Introduction to Data Loggers

What is a Data Logger?

Technically speaking, a data logger is any device that can be used to store data. This includes many data acquisition devices such as plug-in boards or serial communication systems which use a computer as a real time data recording system. However, most instrument manufacturers consider a data logger a stand alone device that can read various types of electrical signals and store the data in internal memory for later download to a computer.
The advantage of data loggers is that they can operate independently of a computer, unlike many other types of data acquisition devices. Data loggers are available in various shapes and sizes. The range includes simple economical single channel fixed function loggers to more powerful programmable devices capable of handling hundreds of inputs.

Choosing a Data Logger

When choosing a data logger the following parameters should be considered.
Input Signal
OMEGA offers data loggers that are compatible with most types of signals. Some data loggers are dedicated to a certain input type while others are programmable for different types of inputs. OMEGA offers data loggers for the following types of signals. AC Voltage/Current Light On/Off Shock/Acceleration
Bridge/Strain/Load/Pressure Motor On/Off Sound
Dew point PH Pressure Temperature
Event or State Process Voltage/Current Thermistor
Frequency Relative Humidity Thermocouple
Level RTD

Number of Inputs

Data Loggers are available in both single and multi-channel designs. Some data loggers are capable of handling hundreds of inputs. OMEGA's OMB-LOGBOOK-300 for example is expandable to over 400 channels.

Size
In many applications space is a limitation. In those cases the size of the data logger may be a critical selection parameter. OMEGA's OM-CP family of data loggers are extremely compact and include models for most input types.

Speed/Memory
In comparison to real time data acquisition systems, data loggers generally have low sample rates. This is normally because they store data in internal memory which is limited. The higher the data rates the more memory required. Therefore when specifying a data logger it is important to determine the sample rate and the sample duration which can be used to calculate the required memory. For example. If an application requires sample rates of 1 per second and the test must last one hour, the data logger must be able to store 3600 samples(1 sample/sec x 1 hour x 3600 seconds/hour).

How does a data logger work?

Connect the data logger to a computer. Then use the software to select logging parameters (how often to take a measurement, start time, etc.) and start the logger. Disconnect the logger and place it in the desired location. The logger records each measurement and stores it in memory along with the time and date. Reconnect your logger to the computer and use the software to read out the date and see these measurements as a graph, showing the profile over time. The tabular data can be viewed as well, or exported to a spreadsheet for further manipulation.

To Learn more info about data logger, please visit Omega site

Data Logger Types

Miniature Single Input Data Loggers

Miniature single input data loggers are generally low cost loggers dedicated to a specific input type. These types of data loggers are often used in the transportation industry. A typical application would be to include a temperature data logger in a shipment of food products to insure that the food temperature does not exceed acceptable limits. In addition to temperature miniature data loggers are available for a large variety of input types. most input types.

Fixed Mount Multi-Channel Data Loggers

Fixed input loggers have a fixed number of input channels which are generally dedicated for a specific type of input. OMEGA offers fixed input data loggers ranging from one to 8 channels.
Handheld Multi-Channel Data Loggers
Handheld multi-channel loggers are commonly used in applications where the data logger is to be carried from one location to another. They are also commonly used in benchtop or laboratory environments. In addition to storing data internally some models even contain on board printers which can produce an immediate hardcopy of the data.

Modular Data Loggers

A modular data logger is configurable and expandable through the use of plug-in modules. The modules are normally field configurable and the user has the option of adding as many channels to satisfy the application requirement.

Data Logger System

DI-710 Data Logger products operate Stand-alone or PC-connected

Low-Cost, Portable, USB or Ethernet Data Logger or Data Acquisition System.
16 single-ended, 8 differential analog inputs.

Stand-alone data logger option allows in-the-field measurements to be saved to Secure Digital Cards (SD).

Built-in Real Time Clock allows automatic time and date stamping of data acquired to SD memory when used in the stand-alone mode.

14-bit analog to digital conversion.

Includes WinDaq Software.

Record up to 14,400 samples per second with Stand-alone models or up to 4,800 samples per second with PC-connected instruments (WinDaq/HS required to achieve recording rates over 1,108 Hz with PC-connected instruments).

Measurement range of ±10mV to ±10V (-L Models) or ±1.25V to ±10V (-H Models).

Built-in Input to Output Isolation. See the application note Process Current Measurements Using the DI-710.

View the stand-alone data logger application note with accompanying demonstration videos: Three Easy Steps to Stand-alone Data Logging.

For the same features with signal-conditioned inputs, try the DI-715B Series (with DI-5B Modules) or the DI-718B Series (with DI-8B Modules).

More details about data logger system from dataq.com

About Data Loggers and Data Recorders

Data loggers and data recorders acquire digital data from sensors and other signals. They are primarily used to store data for subsequent downloads to a host PC, but may also include real-time features such as monitors and alarms. Important specifications to consider when searching for data loggers and data recorders include differential analog input channels, digital I/O channels, sampling frequency, resolution, and accuracy. Differential channels use the difference between two signals as an input; common mode is filtered out. In some systems, differential inputs are combinations of two single-ended inputs; in this case, twice the number of differential channels would be available as single-ended inputs. Digital or discrete channels are used for low-level on-off signals used in applications such as communication, user interface, or control. Sampling frequency is the frequency of the analog signal sampling and conversion to a digital value. Resolution refers to the degree of fineness of the digital word representing the analog value. A ten-bit number contains 210, or 1024, increments. A 0-10V signal could therefore be resolved into approximately 0.01V increments. A 12-bit representation would be in 212 (4096) increments, or divisions of 0.0024V for the same signal. Each additional bit doubles the resolution, and one bit is required for the polarity (sign) of a number. Data loggers and data recorders accuracy depends on the signal conditioning linearity, hysteresis, temperature considerations, etc. It is represented here as percent full scale of measurement range.

Common form factor for data loggers and data recorders include IC or board mount, circuit board, panel or chassis mount, modular bay or slot system, rack mount, DIN rail, and stand-alone. Applications include general lab or industrial, environmental, vehicular, marine, aerospace or military, seismic or geotechnical, weather or meteorology, and medical or biomedical. Common signal inputs available for data loggers and data recorders include DC voltage, DC current, AC voltage, AC current, frequency, and charge. Sensor inputs include accelerometer, thermocouple, thermistor, RTD, strain gauge or bridge, and LVDT or RVDT. Specialized inputs include encoder, counter or tachometer, timer or clock, and relay or switch. Transducers and excitation are also important to consider when searching for data acquisition. Many data loggers and data recorders have integral sensors or transducers. These sensors can have voltage or current excitation. Common outputs for data acquisition products include voltage output, current output, frequency output, timer or counter output, relay output, and resistance or potentiometer output.

Considering the user interfaces available is important when searching for data loggers and data recorders. User interfaces available include no display, front panel and display, touch screens, hand-held or remote programmers, and computer programmable. Host connection choices include direct backplane interface, RS232, RS422, ST485, USB, IEEE 1394, GPIB, SCSI, TTL, parallel, Ethernet, modem, and radio or telemetry. The transmission rate of data is important to consider. Many data loggers and data recorders are web enabled for web addressing. Additional specifications to consider when searching for data acquisition systems and instruments include application software, memory and storage, network specifications, and environmental parameters.

Souce about data logger from GlobalSpec Site

Data Logger Frequently Asked Questions(FAQ)

Why Choose a Data Logger Over Other Types of Data Collection Instruments?

Three types of instruments are commonly used for collecting and storing data. They are 1)Real-Time Data Acquisition Systems, 2)Chart Recorders and 3)Data Loggers

Data loggers are normally more economical than chart recorders. They offer more flexibility and are available with a greater variety of input types. Most data loggers collect data which may be directly transferred to a computer. Although this option is available with some recorders, it normally adds significant expense to the recorder price.
Data acquisition systems offer a great deal of flexibility and are certainly attractive when high sample rates are required, however, since they require connection or installation into a computer, the computer must also be present and active when collecting the data. Data loggers can collect data independently of a computer. Data is normally collected in non-volatile memory for later download to a computer. The computer does not need to be present during the data collection process. This makes them ideally suited for applications requiring portability.

data logger faq What is the Maximum Sample Rate for a Data Logger?
The sample rate depends on the specific model. Although most data loggers have a maximum data rate of 1 or 2 samples per second, OMEGA offers a number of data loggers that can sample in excess of 100 samples per second.

How are the Data Loggers Powered?
Most data loggers are battery powered some also offer an option for external power.

How Long Does the Battery Powered Logger Last?
The battery life of a data logger depends on a number of parameters including the specific model and sample rate. In general the faster the sample rate the shorter the battery life. Many OMEGA data loggers feature a battery life as long as ten years.

Will the Data Logger Loose its Data if the Power or Battery Fails ?
Most OMEGA data loggers use non-volatile memory for data storage. This means that the data will not be lost if the power fails.

How Long Can the Data Logger Record Data?
The recording duration is dependent on the memory capacity of the data logger and the desired sample rate. To determine the duration divide the memory capacity(number of samples the device can record) by the sample rate. As an example assume that a given data logger can store 10,000 samples. If it is desired to record 2 samples every minute, the data logger can run for 10,000/2 or 5,000 minutes(about 3.5 days). If the sample rate was cut in half(1 sample per minute), the recording period would double to 7 days.

Ideal for use over large areas, the widely used EnviroMon data logging and alarm system is a network based system capable of automatically measuring and recording readings from up to forty sensors, and providing warnings when readings go out of range.

Whatever your data logging requirements, a Pico data logger provides an easy-to-use and accurate solution at a competitive price.

Want to get more data loggers FAQ, please visit Omega site

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BENEFITS OF USING DATA LOGGERS

One of the primary benefits of using data logging for systems monitoring is the ability to collect data on a 24-hour, around-the-clock basis. Upon activation, the loggers are deployed and left unattended to gather and record information for the duration of the monitoring period. This allows for a more complete and accurate picture of the target system's overall performance. Because some condition changes take place over long periods of time or when no one is present, the use of data loggers is much more efficient and feasible than performing "spot checks" to gather data manually.

Another important benefit is the ability to collect data in hard-to-reach areas through the use of built-in or external sensors. Temperature, relative humidity, CO2, voltage, amperage, pressure, light, many other types of data can be monitored in areas that would otherwise be too difficult or cumbersome to access such as electrical junction boxes, air return vents, water recovery tanks, motor and fan housings, to name a few. Loggers with external input capabilities may be wired to existing gauges and sensors that have voltage output terminals, thereby allowing these devices to be monitored and recorded, also.

Data loggers incorporate the latest in digital technology making them smaller, less expensive, more accurate and more reliable than chart recorders. Furthermore, data is stored in digital format which allows for more convenient analysis, presentation and storage. There is no need for costly and inconvenient chart supplies because the data is viewed on a PC or laptop computer. The small, unobtrusive size of some data loggers makes them easy to hide for inconspicuous data collection.

Additionally, many benefits can be realized from choosing data loggers over data acquisition systems for performance monitoring. Data acquisition systems often require the installation of extra circuit boards and controls in the PC along with the connection and wiring of cables and sensors. These systems work well in permanently configured, on-line applications but can be very expensive and difficult to implement, especially when short-term monitoring is all that is required. Data loggers significantly reduce the price per channel for most logging applications, are easier to deploy and can be placed in areas that permanent, digital systems can not reach. They can also be easily removed and reused in other application studies, because they require no extra wiring and are stand-alone devices.

For more benefit of data logger from automatedbuildings.com

EasySense Data Logger

Bringing Technology into the classroom can be easy and transparent with the EasySense Data Logger. No need to spend hours just learning the equipment!

The EasySense is an exciting new interface system that gives your students the power to quickly and easily collect, graph, and analyze data in any field of science. This portable, user friendly device for capturing and storing data can be used as a stand-alone meter for monitoring an experiment or to collect data that students can upload to a computer for analysis. It even features a built-in LCD screen that enables students to set up experiments while away from the computer so they can repeat or change experiments without uploading data. easysense data logger

PC Oscilloscope

Turn your PC into a multi-function oscilloscope!

Picoscope software turns a PC into an oscilloscope, a spectrum analyzer, and a meter. A wide range of professional PC based instruments that offer all the functionality of conventional test equipment and many features not normally available in this price range. Collect and display data from up to four channels at the same time.

Source from arborsci.com

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XR440 Pocket Data Logger

The XR440 Data Logger was designed for easy setup and trouble free operation. Direct-connect sensors include Temperature, Humidity, Pressure, AC current, AC Voltage, Light and Process Signals. The Data Logger's four input channels accept any combination of the above sensors, plus resistive, 0-5 vdc signals, and contact closures.

Stands alone: The XR440 Data Logger does not require a computer while it is logging. You connect it to a computer using a serial RS232 cable (Part No. IC209, listed below) for setup, data transfer or to display readings in real time. You can also communicate with the Data Logger using cellular or land-line modems, or a wireless link.

Long life: Battery life with any combination of sensors is over two years (continuous operation). All sensors are powered from the logger's battery. The battery is user-replaceable (standard 9 volt size). xr440 pocket data logger

Connect sensors: Lead wires from PACE Probes and Sensors are connected to the Data Logger's detachable terminal block using a screw driver.

Easy to use: To start logging, the user selects the Data Logger's Setup screen using Pocket Logger Software (available for free download). 'Point and click' choices include start and run mode, channel scaling, and sample rate (2 seconds to 12 hours - fast sampling from 1Hz to 200Hz is also available, but with reduced functionality, see specifications for details). Text fields describing the logging session can be edited. A single 'Click' sends the Setup to the Pocket Logger.

Transfer data: Data may be transferred using a serial cable, a wireless link, or using modems (cellular or land line). Data transfers do not interfere with any on-going logging session.

Network: Multiple XR440 Data Loggers can be networked using the PACE M31 Multiplexer.

Graph data: A presentation-quality graph displays on your PC immediately after transferring data. Data can be easily exported to spreadsheet or statistical programs.

Key Benefits
Four multi-purpose inputs; mix and match PACE sensors in any combination.
Each input will also read resistance, 0-5 vdc or a contact closure.
Data retention of over 200 years with no power.
High accuracy, up to +/-0.15°C and +/-0.25% F.S. with no calibration.
Adjustable resolution of 12, 10 or 8 bits (lowering resolution increases reading storage capacity, see specifications).
Wide operating temperature range -40°C to 60°C (-40°F to 140°F).
Certificate of Validation, traceable to NIST, included with each unit.
Long battery life, runs unattended for over 2 years (including sensors) without external power.
Optional Pulse Module for tipping bucket rain gage, gas and water meters, and kWH meters.
Optional Scaling Module for +/-5, 0-10, ±17, 0-20, ±27, 0-30, ±60, 0-60 vdc and 4-20 ma signals.
Optional Thermocouple / Millivolt Modules for thermocouple or millivolt signal.
Easy to use Windows software (full version available for free download) for logger setup, data transfer, graphing and data export.
CE Marked.
Y2K compliant.
Detailed Specifications
Frequently Asked Questions

Pricing
Part No. Price Description
XR440 $499. Standard XR440, stores up to 32,256 readings
XR440-M $599. XR440 with 4 times larger memory, stores up to 129,024 readings

Each XR440 Pocket Data Logger includes battery, terminal block and Certificate of Traceable Validation. Pocket Logger Software included with each order.

Warranty: The XR440 Data Logger is backed by a 3 year limited warranty. XR440 Accessories (sensors, probes, etc.) are backed by a 1 year limited warranty.

Learn more info about XR440 pocket data logger from pace-sci.com

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